Hi All,
I was able to overcome the earlier problem by using "probe()" function and checking if the return value is initialized or not:
optional<std::pair<int,int>> ret = *((*g).process_group()).probe();
if(ret)
{
    //process message
}
else
{
//perform other local computation
}

Thanks,
Nikhil

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To: boost-mpi@lists.boost.org
Subject: Boost-mpi Digest, Vol 12, Issue 6
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Today's Topics:

1. Use of poll member function of mpi_process_group
(nikhil deveratha hegde)

----------------------------------------------------------------------

Message: 1
Date: 22 May 2014 17:24:25 -0000
From: "nikhil deveratha hegde" <ndhegde@rediffmail.com>
To: "boost-mpi@lists.boost.org" <boost-mpi@lists.boost.org>
Subject: [Boost-mpi] Use of poll member function of mpi_process_group
Message-ID: <20140522172425.10392.qmail@f4mail-235-232.rediffmail.com>
Content-Type: text/plain; charset="utf-8"

Hi All,
I am trying to use the poll function (asynchronous version) in this way:

*(g->process_group()).poll(false);

However, I get an assertion failure:
=============================
/usr/local/include/boost/optional/optional.hpp:631: typename boost::optional_detail::optional_base<T>::reference_type boost::optional<T>::get() [with T = std::pair<int, int>]: Assertion `this->is_initialized()' failed.
=============================

I understand that poll function returns the optional<T> object and one can check the status of this object to see if an initialized/uninitialized object is returned. I tried doing something like:

optional<std::pair<int,int>> retval(*(g->process_group()).poll(false))

But still saw the assertion failure.

Could anyone please tell me if there is a problem with the way I have built the parallel BGL library or if my way of using this function is incorrect? I am using parallel BGL version 0.7.0.

I would greatly appreciate any hints, solutions.

Thanks,

Nikhil
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